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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.adv_scenarios.single_header_customizations.multiple_translation_units"></a><a class="link" href="multiple_translation_units.html" title="Header-only with multiple translation units">Header-only
        with multiple translation units</a>
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<p>
          It is possible to use the header-only variant of the <span class="emphasis"><em>Unit Test
          Framework</em></span> even if the test module has multiple translation units:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              one translation unit should define <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a> and include
              <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
            </li>
<li class="listitem">
              all the other translation units should include <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
            </li>
</ul></div>
<p>
          An example might be the following:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p class="simpara">
              Translation unit 1, defines <a class="link" href="../../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a>
            </p>
<pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_TEST_MODULE</span> <span class="identifier">header</span><span class="special">-</span><span class="identifier">only</span> <span class="identifier">multiunit</span> <span class="identifier">test</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test1</span> <span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span>
    <span class="identifier">BOOST_CHECK</span><span class="special">(</span> <span class="identifier">i</span><span class="special">*</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
</li>
<li class="listitem">
<p class="simpara">
              Translation unit 2, includes <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
              instead of <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>:
            </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test2</span> <span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span>
    <span class="identifier">BOOST_CHECK</span><span class="special">(</span> <span class="identifier">i</span><span class="special">*</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
</li>
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